button: adapted gpio handling to latest riot

Author: smlng

src/button/main.c

@@ -5,45 +5,14 @@
 #include "board.h"
 #include "periph/gpio.h"
 
-// compatibility
-#ifndef LED_ON
-#define LED_ON      LED_RED_ON
-#define LED_OFF     LED_RED_OFF
-#define LED_TOGGLE  LED_RED_TOGGLE
-#endif
-
-// button parameters, matching Atmel SAM R21 board
-#ifdef BOARD_SAMR21_XPRO
-#define BTN_PORT    0   // Port+Pin A28
-#define BTN_PIN     28
-#define BTN_PULL    GPIO_PULLUP
-#define BTN_FLANK   GPIO_BOTH
-#else
-// or button parameters, matching Phytec phyWAVE
-// Note: port is ignored, only pin is used by GPIO
-//#ifdef BOARD_PBA_D_01_KW2X
-#define BTN_PORT    0   // Port+Pin D1
-#define BTN_PIN     3
-#define BTN_PULL    GPIO_PULLUP
-#define BTN_FLANK   GPIO_BOTH
-#endif
-
 /**
  * @brief   callback function for button interrupt
  *
- * @param[in] arg   contains gpio pin
+ * @param[in] arg   NULL
  */
 static void btn_callback(void* arg)
 {
-    gpio_t pin = *((gpio_t*)arg);
-    if (gpio_read(pin)) {
-        puts("LED off");
-        LED_OFF;
-    }
-    else {
-        puts("LED on");
-        LED_ON;
-    }
+    LED0_TOGGLE;
 }
 
 /**
@@ -53,21 +22,21 @@ static void btn_callback(void* arg)
  */
 int main(void)
 {
-    puts("SmartUniversity - Button Example!");
-    puts("================");
+    puts(" SmartUniversity - Button Example! ");
+    puts("===================================");
     printf("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
     printf("This board features a(n) %s MCU.\n", RIOT_MCU);
-    puts("================");
+    puts("===================================");
 
     // init button as interrupt to trigger LED
-    int gpio_pin = GPIO(BTN_PORT, BTN_PIN);
-    if (gpio_init_int(gpio_pin, BTN_PULL, BTN_FLANK, btn_callback, (void *)&gpio_pin) < 0) {
-        printf("Error while initializing  PORT_%i.%02i as external interrupt\n",
-               BTN_PORT, BTN_PIN);
+    gpio_t pin = BUTTON_GPIO;
+    gpio_mode_t mode = GPIO_IN_PU;
+    gpio_flank_t flank = GPIO_FALLING;
+    if (gpio_init_int(pin, mode, flank, btn_callback, NULL) < 0) {
+        puts("Error while initializing  BUTTON_GPIO as external interrupt!");
         return 1;
     }
-    printf("PORT_%i.%02i initialized successful as external interrupt\n",
-           BTN_PORT, BTN_PIN);
+    printf("BUTTON_GPIO initialized successful as external interrupt.");
 
     // infinity loop 1
     while(1) {